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1. 发明授权

US07738347B2 Optical pickup device and optical disk drive 失效
标题翻译：光学拾取装置和光盘驱动器
公开(公告)号：US07738347B2
公开(公告)日：2010-06-15
申请号：US11850536
申请日：2007-09-05
申请人： Mayumi Tsukamoto , Masaharu Fukakusa , Hiroshi Sato , Eizo Ono
发明人： Mayumi Tsukamoto , Masaharu Fukakusa , Hiroshi Sato , Eizo Ono
IPC分类号： G11B7/00
CPC分类号： G11B7/1378 , G11B7/0909 , G11B2007/0006 , G11B2007/13722
摘要： An optical pickup device includes: a laser source for emitting, to an optical disk, a laser beam having a wavelength λ1 and a laser beam having a wavelength λ2, which is longer than the wavelength λ1; a light receiver, for receiving laser beams that are reflected by the optical disk; a beam splitter, for directing, to the light receiver, the laser beams reflected by the optical disk; and an astigmatism generation element, located between the beam splitter and the light receiver, for generating the laser beams to be used for focusing control, by designating as the front of the light receiver a focal point on one of the intersecting cross sections that include the light axes of the laser beams, and by designating as the rear of the light receiver, a focal point on the other cross section, wherein the astigmatism generation element is an optical element, which is like a Fresnel lens, whose step depth is substantially a natural number times either the wavelength λ1 or the wavelength λ2.
摘要翻译：光学拾取装置包括：激光源，用于向光盘发射波长λ1的激光束和比波长λ1长的具有波长λ2的激光束; 光接收器，用于接收由光盘反射的激光束; 分束器，用于将由光盘反射的激光束引导到光接收器; 以及位于分束器和光接收器之间的用于产生用于聚焦控制的激光束的像散生成元件，通过将光接收器的前部指定为包括激光束的光轴，并且通过将光接收器的后部指定为另一横截面上的焦点，其中像散生成元件是像菲涅耳透镜的光学元件，其阶梯深度基本上是自然数为波长λ1或波长λ2。

2. 发明申请

US20090040910A1 Optical pickup device and optical disk device 有权
标题翻译：光拾取装置和光盘装置
公开(公告)号：US20090040910A1
公开(公告)日：2009-02-12
申请号：US12187900
申请日：2008-08-07
申请人： Masaharu Fukakusa , Hideki Yoshinaka , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
发明人： Masaharu Fukakusa , Hideki Yoshinaka , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
IPC分类号： G11B7/135 , G11B7/00
CPC分类号： G11B7/1275 , G11B7/0909 , G11B7/131 , G11B7/1362 , G11B2007/0006
摘要： A light source emits light with a first wavelength and light with a second wavelength longer than the first wavelength toward an optical disk from adjacent positions. An optical receiver detects light reflected from the optical disk. An astigmatism-generating element generates light used for focus control in a condition where a focusing position on one of two perpendicular cross sections including an optical axis of the light reflected from the optical disk is located ahead of the optical receiver and a focusing position on the other cross section is located behind the optical receiver are included. The astigmatism-generating element is a Fresnel mirror configured to include a plurality of reflecting mirrors. A level difference between the reflecting mirrors adjacent to each other is distributed in a range from a depth of substantially (natural number/2) times the first wavelength to (natural number/2) times the second wavelength
摘要翻译：光源将第一波长的光和比第一波长长的第二波长的光从相邻的位置发射到光盘。光接收器检测从光盘反射的光。散光产生元件产生用于聚焦控制的光，其中包括从光盘反射的光的光轴的两个垂直横截面之一上的聚焦位置位于光接收器之前的聚焦位置和其他横截面位于光接收器后面。散光产生元件是被配置为包括多个反射镜的菲涅耳镜。彼此相邻的反射镜之间的电平差分布在从第一波长的大致（自然数/ 2）倍到第二波长的（自然数/ 2）倍的深度的范围内

3. 发明授权

US08270265B2 Optical pickup device and optical disk device 失效
标题翻译：光拾取装置和光盘装置
公开(公告)号：US08270265B2
公开(公告)日：2012-09-18
申请号：US12187167
申请日：2008-08-06
申请人： Hideki Yoshinaka , Masaharu Fukakusa , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
发明人： Hideki Yoshinaka , Masaharu Fukakusa , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
IPC分类号： G11B7/00
CPC分类号： G11B7/0909 , G11B7/131 , G11B7/1356 , G11B7/1362 , G11B2007/0006
摘要： An optical pickup device or an optical disk device includes: a light source 11 that emits a laser beam toward an optical disk 25; an optical receiver 18 that detects light reflected from the optical disk 25; and an astigmatism-generating element 31 that generates light used for focus control in a condition where a focusing position on one of two perpendicular cross sections including an optical axis of the light reflected from the optical disk 25 is located ahead of the optical receiver 18 and a focusing position on the other cross section is located behind the optical receiver 18. The astigmatism-generating element 31 is a Fresnel mirror 31a configured to include a plurality of reflecting mirrors, and an imaginary surface 31d that connects the tips of the reflecting mirrors is curved in a concave shape toward a light incidence side.
摘要翻译：光拾取装置或光盘装置包括：朝向光盘25发射激光束的光源11; 检测从光盘25反射的光的光接收器18; 以及产生用于聚焦控制的光的像散生成元件31，其中在包括从光盘25反射的光的光轴的两个垂直横截面中的一个垂直截面上的聚焦位置位于光接收器18的前方，在另一横截面上的聚焦位置位于光接收器18的后面。像散生成元件31是被配置为包括多个反射镜的菲涅尔镜31a，并且连接反射镜的前端的虚拟表面31d 弯曲成朝向光入射侧的凹形。

4. 发明申请

US20090040893A1 Optical pickup device and optical disk device 失效
标题翻译：光拾取装置和光盘装置
公开(公告)号：US20090040893A1
公开(公告)日：2009-02-12
申请号：US12187167
申请日：2008-08-06
申请人： Hideki Yoshinaka , Masaharu Fukakusa , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
发明人： Hideki Yoshinaka , Masaharu Fukakusa , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
IPC分类号： G11B5/58
CPC分类号： G11B7/0909 , G11B7/131 , G11B7/1356 , G11B7/1362 , G11B2007/0006
摘要： An optical pickup device or an optical disk device includes: a light source 11 that emits a laser beam toward an optical disk 25; an optical receiver 18 that detects light reflected from the optical disk 25; and an astigmatism-generating element 31 that generates light used for focus control in a condition where a focusing position on one of two perpendicular cross sections including an optical axis of the light reflected from the optical disk 25 is located ahead of the optical receiver 18 and a focusing position on the other cross section is located behind the optical receiver 18. The astigmatism-generating element is a Fresnel mirror 31a configured to include a plurality of reflecting mirrors, and an imaginary surface 31d that connects the tips of the reflecting mirrors is curved in a concave shape toward a light incidence side.
摘要翻译：光拾取装置或光盘装置包括：朝向光盘25发射激光束的光源11; 检测从光盘25反射的光的光接收器18; 以及产生用于聚焦控制的光的像散生成元件31，其中在包括从光盘25反射的光的光轴的两个垂直横截面中的一个垂直截面上的聚焦位置位于光接收器18的前方，在另一横截面上的聚焦位置位于光接收器18的后面。散光产生元件是被配置为包括多个反射镜的菲涅耳镜31a，并且连接反射镜的末端的假想表面31d是弯曲的朝向光入射侧呈凹形。

5. 发明授权

US07889620B2 Optical pickup device and optical disk device 有权
标题翻译：光拾取装置和光盘装置
公开(公告)号：US07889620B2
公开(公告)日：2011-02-15
申请号：US12187900
申请日：2008-08-07
申请人： Masaharu Fukakusa , Hideki Yoshinaka , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
发明人： Masaharu Fukakusa , Hideki Yoshinaka , Mayumi Tsukamoto , Satoshi Nagata , Eizo Ono
IPC分类号： G11B7/00
CPC分类号： G11B7/1275 , G11B7/0909 , G11B7/131 , G11B7/1362 , G11B2007/0006
摘要： A light source emits light with a first wavelength and light with a second wavelength longer than the first wavelength toward an optical disk from adjacent positions. An optical receiver detects light reflected from the optical disk. An astigmatism-generating element generates light used for focus control in a condition where a focusing position on one of two perpendicular cross sections including an optical axis of the light reflected from the optical disk is located ahead of the optical receiver and a focusing position on the other cross section is located behind the optical receiver are included. The astigmatism-generating element is a Fresnel mirror configured to include a plurality of reflecting mirrors. A level difference between the reflecting mirrors adjacent to each other is distributed in a range from a depth of substantially (natural number/2) times the first wavelength to (natural number/2) times the second wavelength.
摘要翻译：光源将第一波长的光和比第一波长长的第二波长的光从相邻的位置发射到光盘。光接收器检测从光盘反射的光。散光产生元件产生用于聚焦控制的光，其中在包括从光盘反射的光的光轴的两个垂直横截面之一上的聚焦位置位于光接收器之前的聚焦位置和其他横截面位于光接收器后面。散光产生元件是被配置为包括多个反射镜的菲涅耳镜。彼此相邻的反射镜之间的电平差分布在从第一波长的大致（自然数/ 2）倍到第二波长的（自然数/ 2）倍的范围内。

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